Implement fuzzy API testing

[rsnyman]

Use Schemathesis to provide fuzzy testing on the API so that we can find and fix errors.

[lina-is-here]

I've just found out that it can be part of GH actions https://github.com/schemathesis/schemathesis/releases/tag/v3.16.0
I can work on this issue

[Stranger6667]

Hey! Let me know if you need any support from the Schemathesis side :) I’d be happy to collaborate

[swadeley]

Hello @lina-is-here

Is this issue resolved by #376 ?